Touch Panel Metal Mesh Staggered Pattern for Sensitivity and Fringe Elimination
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Solution Overview
Problem
Current touch panels suffer from low touch sensitivity, which affects user experience and is inconvenient, and they also generate interference fringes when used with various display sizes, increasing production costs.
Innovation Solution
A touch panel design featuring a light transmissive substrate with oppositely disposed sensing units, each comprising metal meshes with specific patterns and angles, forming a staggered pattern with irregular polygons and radial patterns, which increases capacitance variation and reduces node area, thereby enhancing sensitivity and eliminating interference fringes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional metal mesh patterns are used in touch panels, then manufacturing is simpler, but touch sensitivity is low and interference fringes are generated
Solution Approach 1:
The patent applies asymmetry by using irregular polygon patterns instead of conventional symmetric grid patterns for metal meshes. Each polygon has randomly determined angles and side lengths, creating an asymmetric structure that increases capacitance variation under touch, thereby improving touch sensitivity while avoiding the regularity that causes interference fringes
Solution Approach 2:
The patent transitions from two-dimensional grid patterns to three-dimensional staggered layering. Multiple metal mesh layers are positioned at different depths (first, second, and third layers) with offset patterns, creating a multi-dimensional structure that enhances capacitance sensitivity without increasing surface complexity
2Reliability
If metal mesh patterns with nodes are used, then capacitance variation is sufficient for touch detection, but interference fringes are generated when used with various display sizes
Solution Approach 1:
The patent extracts and removes the node points from the metal mesh pattern. By using irregular polygons without intersecting lines (node-free design), the patent eliminates the source of interference fringes while maintaining sufficient capacitance variation through the polygon shapes themselves, which are randomly distributed and sized to ensure reliable touch detection
Solution Approach 2:
The patent changes the geometric parameters of the metal mesh pattern from regular grids with nodes to irregular polygons without nodes. The angles and dimensions of polygons are randomly determined within specific ranges, creating parameter variation that maintains detection reliability while eliminating the periodicity that causes interference fringes across different display sizes
3Ease of manufacture
If conventional sensing electrode patterns are used, then manufacturing cost is lower, but production cost increases due to interference fringe issues requiring additional processing
Solution Approach 1:
The patent uses imitation sensing electrodes that replicate the appearance and functional characteristics of conventional sensing electrodes without requiring complex node structures. These imitation electrodes use simple irregular polygon patterns that can be manufactured with standard processes, avoiding the need for additional processing to handle interference fringes, thereby maintaining ease of manufacture while improving production efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves touch sensitivity and reduces production costs by increasing capacitance variation and eliminating interference fringes, allowing for effective use with various display sizes without node-related diffraction effects.
Implementation Method 1
increases capacitance variation and reduces node area, thereby enhancing sensitivity
Implementation Method 2
a light transmissive substrate; a first sensing unit including a plurality of first sensing electrodes disposed on a first surface of the light transmissive substrate
Data Source
AI summary
A touch panel and a touch display are disclosed. The touch panel mainly comprises a light transmissive substrate and two sensing units. The two sensing units are disposed oppositely through the light transmissive substrate. A mesh width of a metal mesh in the two sensing units is large, which can increase a variation of capacitance value and improve the touch sensitivity. In addition, an angle between metal lines with sensing function is configured in a random manner under a certain condition to reduce an area of nodes, thus a rounding effect at the nodes can be effectively reduced or eliminated. The metal meshes of the two sensing units disposed oppositely are staggered with a non-conductive node-free pattern to form a staggered pattern with irregular polygons, so that no interference fringes would be generated when the touch panel is used together with display panels of various mainstream sizes.